@article{SF_1992__44_1_135162,
     author = {L. San Martin},
     title = {Nonreversibility of subsemigroups of semi-simple {Lie} groups.},
     journal = {Semigroup forum},
     pages = {376--387},
     publisher = {mathdoc},
     volume = {44},
     number = {1},
     year = {1992},
     zbl = {0758.22003},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135162/}
}